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n in (-oo:+oo)
2/9 = n/13 // - n/13
2/9-(n/13) = 0
2/9-1/13*n = 0 // - 2/9
-1/13*n = -2/9 // : -1/13
n = -2/9/(-1/13)
n = 26/9
n = 26/9
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